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Quantitative Aptitude

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Permutation, Combination & Probability

Question
10 out of 20
 

How many 3-digits number can be formed using 0,1,3,5,7 when Repetition are allowed?



A 55
B 100
C 54
D 120
E None of These

Ans. B

For 3 digit no. “0” never came on A’s place so rest 4 digit can be filled on it on B’s place all 5 digit came while on C’s place all 5 digit came . so total arrangement = 4 x 5 x 5 = 100

Permutation, Combination & Probability Flashcard List

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